Volta
Senior Member
- Location
- Columbus, Ohio
The customer (restaurant) had their main trip yesterday, They reset it before they had me there. The (service) panel is 3 phase, the 300 amp main breaker is an ITE JXD23B300, the wire connectors are TA2J6500, made for parallel, but using one 300 or 350 cu per phase (can't tell precisely).
Without vouching for the absolute accuracy due to emissivity, with a simple IR thermometer I read up to 140 deg F on A, 166 on C, and 209 on C phase, all on the line connection, while the max currents were 81, 83, and 60 amps respectively.
New installation this year by others, with used equipment. Visually looked ok, no discoloration yet.
Had the PUCO there this morning, they disconnected C phase (only ), I removed the line connection with a torque wrench, it seemed to be at least the 300 lb-in needed, looked ok within. I removed the wire connector by hand, felt that the two bolts should have been tighter, but no numbers to go by. Looked ok, a little anti-ox and fine steel wool, reassembled, and found very similar temperature differences from phase to phase.
Long story, I know. I think we need a new breaker. At about $2000 new locally though, less online new or used, I just want to be as sure as possible before we do it.
The temp after the reconnection from line side to load was: A line 114, load 109. B line 126, load 116. C line 183, load 146. Currents were 64, 49, and 58.
A few inches torward the utility from the main the conductors were under 100 deg F.
Think I'm missing anything? Could it be anything other than the breaker?
Without vouching for the absolute accuracy due to emissivity, with a simple IR thermometer I read up to 140 deg F on A, 166 on C, and 209 on C phase, all on the line connection, while the max currents were 81, 83, and 60 amps respectively.
New installation this year by others, with used equipment. Visually looked ok, no discoloration yet.
Had the PUCO there this morning, they disconnected C phase (only ), I removed the line connection with a torque wrench, it seemed to be at least the 300 lb-in needed, looked ok within. I removed the wire connector by hand, felt that the two bolts should have been tighter, but no numbers to go by. Looked ok, a little anti-ox and fine steel wool, reassembled, and found very similar temperature differences from phase to phase.
Long story, I know. I think we need a new breaker. At about $2000 new locally though, less online new or used, I just want to be as sure as possible before we do it.
The temp after the reconnection from line side to load was: A line 114, load 109. B line 126, load 116. C line 183, load 146. Currents were 64, 49, and 58.
A few inches torward the utility from the main the conductors were under 100 deg F.
Think I'm missing anything? Could it be anything other than the breaker?
